EFHW Simulation (2m) Example

Discussion in 'Antennas, Feedlines, Towers & Rotors' started by KX4O, Sep 29, 2021.

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  1. KX4O

    KX4O Ham Member QRZ Page

    For you NEC4 folks with a moment to spare, have a look at this model and let me know if you can replicate the results I saw.
    [​IMG]
    NEC2 functions, but with a higher AGT so feel free to use whatever NEC you have with expectations properly managed.
     
  2. AC6LA

    AC6LA Ham Member QRZ Page

    What a tour de force in model building! And an equally impressive write up describing the model and the design process.

    For AutoEZ users, John's *.nec file can be opened directly. The 4nec2 symbols will be automatically converted to AutoEZ variables.

    upload_2021-9-29_23-47-12.png

    Here's a comparison of the Average Gain Test (AGT) results using three different engines.

    upload_2021-9-29_23-46-22.png

    Note that since the ground type is Free Space, the wire loss is Zero, and there are no other loss elements in the model, the Average Gain (columns Q-R) and the Avg Gain Test (columns T-U) results are identical.

    Here are the SWR curves for the three engines.

    upload_2021-9-29_23-48-24.png

    Obviously depending on which engine is available one would have a wildly different opinion on the results of the model.

    The attached zip contains John's model in both AutoEZ and EZNEC formats.

    Dan, AC6LA
     

    Attached Files:

    KX4O and SM0GLD like this.
  3. KX4O

    KX4O Ham Member QRZ Page

    Thanks for your test. Interesting that NEC5's AGT is dead on.
     

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